Albert e



A. F. SULZER.

PHOTOGRAPHIC FILM CARTRIDGE.

APPLICATION FILED MAR. 23. I916- 1,195,746. Patented Aug. 22,1916.

INVENTOR AZZMIZ F 5M6! WITNESSES.

of Rochester,

FFIQ.

ALBERT F. SULZER, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAKCOMPANY, OF ROCHESTER, NEW YORK,

A. CORPORATION OF NEW YORK.

PHOTOGRAPHIC-FILM CARTRIDGE.

Specification of Letters Patent.

- Patented Aug. 22, 11916.,

Application filed March 23, 1916. Serial No. 86,155.

To all whom it may concern:

Be it known that I, ALBERT F. SULZER, in the county of Monroe and Stateof New York, have invented certain new and useful Improvements inPhotographic-Film Cartridges; and I do hereby declare the following tobe a full, clear, and exact description of the same, reference being hadto the accompanying drawings, forming a part of this specification, andto the reference numerals marked thereon.

My present invention relates to photographic roll film or cartridges, inwhich a strip of sensitized film is wound into a roll with a suitableprotective backing and a means for permitting or causing designations tobe light printed on a film by writing against it while in a camera orholder, and it has for its-object to provide certain improvements in themethod of making or treating the backing paper or papers of suchcartridges, for the purpose of preventing the deterioration of thephotographically sensitized surface due to its proximity to a sheetcontaining oils or greases, which have a tendency, after longconfinement, to desensitize or otherwise injure said surface.

To these and other ends the invention consists in certain improvementsand combinations of parts all as will be hereinafter more fullydescribed, the novel features being pointed out in the claims at the endof the specification.

In the drawings: Figure 1 illustrates in perspective view a filmcartridge partly unwound to show the arrangement of the several parts,and Fig. 2 is a detail sectional view greatly enlarged to indicate thevarious coatings on the film, and the superposed wrapping Fig. 3 is adetail sectional view of a modification showing the backing sheetprovided with a coating upon only one of its faces.

Similar reference letters throughout the several views indicate the sameparts.

My invention, generally described, comprehends the treatment of theouter backing or wrapping paper used as a protective covering in thespooling of photographic film, with a coating of suitable sizingmaterial for preventing the absorption by the backing paper of any oilyor greasy substances in more volatile substances from through the paperbacking, when confined therewith in the convolutions of the roll, intocontact with the photographically sensltlzed surface. Thebacking-coating may also possess as a further characteristic a physicalaffinity for the substances comprising the coating of the interleavedsheet for the purpose of assisting in the removal of the coating, underthe action of a stylus employed for applying pressure to the outerbacking, whereby clear out lines are formed on the sheet through whichlight rays may pass.

In illustrating my present invention, I have shown a roll ofphotographic film having the general characteristics of that disclosedin Patent No. 883,819, granted to F. W. Lovejoy, April 7, 1908. In thedrawings, the film or transparent support for the sensitized surface isindicatedby A. This film is attached to a backing paper B employed asthe protecting covering which may be translucent, and in practice Iprefer to employ a red colored paper of such thickness and depth ofcolor that while a number of convolutions or layers thereof Will excludeall light, one thickness will permit the passage of suflicient actinicrays to cause an exposure and light print on the sensitized surface, areproduction of the lines scribed by the stylus. The desired opacity ofthe outer wrappings, to prevent the fogging of the sensitized surface isaccomplished by the interposition of the coated sheet 0 which isinterleaved between the film and the backing paper.

The sheet 0 is preferably a waterproof web or paper having one .of itssurfaces coated witha combination of waxy materials and pigment providedfor the purpose of rendering the web incapable of transmitting actinicrays of light, either alone or in connection with the aper. This coatingmay be composed of wax or paraffin, with which is mixed, in a melted orfluid state, an opaque pigment, such as lamp black, together with asuitable dye for coloring the wax. This coating is further tempered, orsoftened with a mineral or other non-drying oil, which gives the coatingthe characteristic of being capable of substantial removal or, at least,of being rendered light surface of the web by a stylus.

striking The web may be rendered non-absorbent by treating the paper soas to make it waterproof, which may be done either before or after thecoating is applied, and a simple and inexpensive way of making the sheetnon-absorbent is to rovide the surface opposite to that carrying thecoating with a coat of a comparatively hard wax which is transparent,and when applied to the paper tends to make it more translucent so thatwhen the overlying opaque coating is removed in areas, or along linesproduced by a stylus, rays of light may readily pass therethrough toeffect the underlying sensitized surface.

It will be observed in Fig. 2 that the sheet C in the position which itoccupies between the backing B and the film A is disposed with itsopaque coating, or surface d uppermost or adjacent the backing paper Band its waterproof coated surface 6 in contact with the back of thetransparent film support A. Consequently, when the three parts, the filmA, the sheet C and the backing B are wound together in a roll, thebacking paper is interposed in the several convolutions between thefront or sensitized side a of the film, and the coated surface d of thesheet C, and therefore it is very essential that the backing sheet Bshould be treated to prevent possible absorption by its fibers of anyportion of the oily or greasy materials existing in the wax itself, orwhich are used in combination therewith to roduce the easily removablecoating an in so treating the backing paper, it is desirable to renderit more capable of receiving, or having transferred to it, the removablecoating -in order that the desired markings may be made thereon by meansof a stylus without requiring the operator to apply undue pressure, andat the same time insure the sufiicient displacement of the coating toadmit the passa e of light rays, whereby the markings will ephotographically reproduced in the --ensitized surface of the film. As are- Stilt of my experiments, I have determined that satisfactory'resultsmay be obtained, so far as the protecting of the backing paper againstthe absorption of oil or grease is concerned, by coating one side of thebackin paper with a suitable sizing, such as a thin coating of gelatin,although shellac may be utilized for this purpose. If the gelatin isapplied to the under surface I; of the backing paper, it will, whenpressed against the adjacent surface d of the sheet C, cause the latterto adhere to it and come off from the sheet C in clear, sharp lines withcomparatively little pressure applied to the stylus. If, however, it isdesired only to prevent the oily substances from reaching the sensitizedphotographic surface and omitting the feature of the removal of thecoating by its adhering to the gelatin or .ing the shellac sizing of thecovering paper, then the latter may be sized on its outer surface only,since this sizing coat occupies a position, in the convolutions on thespool, in contact with the sensitized surface, and any oil or greaseabsorbed by the fibers of the covering paper will be confined therein.When the covering paper is sized on its outer side only, the coating ofthe sheet C adheres and comes off by contact directly with the coveringpaper under pressure of the stylus thereon. For practical reasons,however, I deem it advantageous to apply the sizing of gelatin orshellac to both sides of the backing sheet as the second coating alsotends to make the backing sheet more impervious, and therefore affordsadditional pfiotection to the sensitized surface a of the It will beunderstood that instead of making the coating absolutely opaque, it maybe of such character that with the outer paper covering, it will preventthe passage of light of sufficient intensity to fog the film but whenthe coating is displaced, sufiicient light will pass to cause thephotographic printing required.

I claim as my invention:

1. A backing for photographic sensitized surfaces embodying a coatedsheet and a superposed exterior covering sheet, the first mentionedsheet having an opaque coating adapted to' be transferred to theexterior covering by contact produced by local pressure such as thatproduced by a stylus and the contacting surface of the covering sheetbeing coated with a sizing material having an affinity for the opaquecovering.

2. A backing for photographic sensitized surfaces embodying an interiorsheet and a superposed exterior covering sheet, both sheets being coatedon their adjacent surfaces, one with a removable coating imperv-ious tothe passage of actinic light rays and the other with a sizing having anafiinity for the coating material, said coatings being adapted tocooperate upon the application of pressure, as by means of a stylus, totransfer the coating along the areas of pressure onto the coveringsheet.

3. A backing for photographically sensitized surfaces embodying aninterior coated sheet and a superposed exterior covering arranged, whenthe parts are rolled together, to occupy a position between thesensitized surface and the interior sheet, said covering having acoating of suitable material thereon serving to protect the sensitizedsurface.

4. A backing for photographically sensitized surfaces embodying aninterior sheet and a superposed exterior covering having a sizing coatthereon serving to deter ingredients carried on the interior sheet fromaffectsensitized surface.

5. A backing for rolled films having roll, between the sensitizedsurface and the interior sheet, and having a coating preventing the oilymaterial of the latter from passing into contact with the sensitizedsurface.

ALBERT F. SULZER.

Witnesses:

RUSSELL B. GRIFFITH, AGNES NESBITT BISSELL.

